Modifications to make wire protocol match prod

Added modifications provide:
* Closer match to current production server
* Address future expansion (reserve "wp-" prefixed field names)
* Resolve Data retention with stateless server
** Ideally UA would return an optional "Last Connect" field to the
    server. If this date is beyond the expiry window, server would
    auto-gen a new UAID. This allows for data stores with self
    expiring records as well as major event recoveries.
* some formatting/spelling/grammar
Merge branch 'master' of https://github.com/jrconlin/simple-push-protocol into jrconlin-master
Merge branch 'jrconlin-master'